Pipe-coupling.



M. P. KELLY.

PIPE GOUPLING.

APPLICATION FILE DDDDDDDDDD a.

938,425. Patented 0ct 26,1909;

INVENTOR UNITED STATES PATENT. OFFICE.

MATHEW F. KELLY, F McKEESPORT, PENNSYLVANIA, ASSIGNOR TO NATIONAL TUBE;

COMPANY, '01 PITTSBUBG, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

v rrrn-cournme.

To alllwhom it may concern:

Be it known that I, ime F. KELLY, of

McKeesport, Allegheny county, Pennsylvania, have invented certain new and useful Improvements in Pipe-Couplings, of which the following is a full, clear, and exact description, reference being had to the accom pan-ylng drawings, forming part of this coupling constructed in aceordance'with my invention; Fig. 21s a longltudinal cross-secspecification, in which I Figure 1 is an end elevation of a pipe tion of the coupling shown in Fig.1; F i .3 is a similar cross-section showinga modi form of coupling.

hly invention relates to pipe couplings or unions adapted for use wlth fluid pressure piping and more particularly for use inmaking connections onhydraulic piping carrying very hi h pressures in locations where it is frequent ynecessary to break the joints formedby the couplings. The contacting faces of the two connecting members of such pipe couplings as constructed heretofore have been constructed one with anann'ular projection which fits into a registering re-f cess located in the face of the opposite coupling member, and in some cases a thin flat third member of the couplings.

couplings the opposing faces of. themembers I must'be drawn up squarely and the tightness gasket has been inserted between the opposing faces ofthe coupling. In other cases the .faces of the opposing members have been plane surfaces, 'a gasket being used or not,-

of the joint depends entirely upon the accuracy of the fit between the faces and how I tightly the members are drawn together.

'In such couplings great difficulty has been experienced in makingti ht' joints, especially'whenused on hydr'au 1c piping-row ng.

to the pressureitself and also to the excessive pressurein the hydraulic'pipingicaused b 'water-hammer and other. shocks met wit I 'in-the use of suchz pipin'g, and when gaskets are employed thecompressibility'of such gaskets determines and the tightness of the joint.-;'

The object ofthe invention is 'to provide an improved pipe coupling or unionv which will maintain a tight joint under thesevere shocks to. which it is subjected when used Specification of Lettersli'atent. Application flied August 3, 1908. 'Serial No. 446,754.

PatentedOct. 26, 1909.

with such piping and which will permit of its'being frequently connected and disconnected without damagin the contacting faces of the coupling mem ers or impairing fhe efliciency of the j'ointmade by the coup- The invention consists in improved means for making tight joints between the 0pp osing faces of the coupling members and means for maintaining such oint-making devices 1n place in the coupling and for preventing such-devices from becoming dislodged or dis laced 4 1 h the drawing, 2 represents one of the detachable members" forming the coupling and 3 its opposing member which are se- 'cured together in place by means of the connecting rin 4 inconnecting .the ends of two pipes. he; rm 4' is provided with internal threads 5 w ich engage'with the external threads 6 on the outside of the coupling-member 2. The ring l isfalso provided with the shoulder 7 which engages with the peripheral shoulder 8 provided on the coupling member 3. The coupling members' 2 and 3 haveinternal' screw threads 9 and 10 into which the threaded ends of the pipes to be connected are secured, the shoulder 7 onthe ring 4 engaging with the shoul- I 'der 8 on the member 3 so asto permit the "ring tobe turned freely and be screwed on the external threaded member 2. The members 2 and 3 are. provided with registering axial openings 11 and'12 for the passage of I thefluid and the member 2 isprovided with the member 3 projects when the parts of the coupling are assembled in'plaoe, the. joint being made between the plane faces 2 and 3 on the membersfl2. and 3. Preferably the recess" 13 is' counterbored so as to, be larger at its inner "end than 'at its mouthand a cup-washer 15 made of leather or other 'com--' I pressible material is inserted in place in the recess. The flange or .rim of the cup-washer 15 is arranged to be expanded by the pressure of the fluid inthe'pipeswhen the coupling is'assembled and in this way maintain a pressureiight joint between the members of the couplin L It' will be understood that cup-washer 15 when the couplin is disconnected orjwhen the pressure is o the piping,

90- a I a recess13 into which the projection {14 on an annular ring 16 is inserted in the cupwasher before the cup-washer is put into place in the recess in the coupling member 2.

In the modification shown in Fig. 3, the

parts are the same exceptthat instead of 'using an annular ring 16 of rectangular cross section as in Fig. 1, a flanged metal cup 16 is employed to hold the cup-washer 15 in place in the recess 13. i

In the assembling of the parts forming the couplings, the parts are connected together in the usual manner. Before bring-' mg the engaging faces of the members 2 and 3 together, the cup-washer 15 with its ring 16 or cup 16 is laced in the recess 13 10- cated in the coup in member '2. The connecting ring 4 18 t en, screwed upon the coupling member 2 to draw the faces of the couplings together and to slightly compress the disk or bottom portion of the :washer 15 between the rin 13 and projection 14, the

coupling ring 4 eing turned by means of'a wrench in the usual manner.

When it is desired to separate the members the coupling ring 4 is turned in theproper direction to unscrew itself from the member 3 and by this operation the joint is broken. The cup-washer 15 having been expanded in the bottom ortion ofthe recess 13 by the action of the uid pressure on the pipe line, will remain in place in this recessowing to the smaller diameter of the outlet ofthis opening. The parts may be' connected and disconnected "any number of times without damage to the coupling and, by reason of the cup-washer, will always maintain a tight joint when the vpressure is.

ap lied to the piping.

odifications 1n the construction and arrangement of the parts may be made without departing from my invention. The recess 13 may be made with straightsides instead of being counterbored as shown and other changes may be made.

I .c aim 1. A pipe coupling, comprising coupling members having opposing surfaces contacting with each other, one of said members having a recess therein; said recess being counter-bored to a larger diameter at its inner end, a coupling member adapted to draw and hold the opposin surfaces in close contact, and a compressib e cup-washer located in said recess and arranged to be expanded 1n the counter-bore of said recess by fluid pressure; substantially as described.

3. A pipe coupling comprising coupling members having opposing surfaces contacting with eachother, one of said surfaces having a recess therein, said recessbeing counter-bored to .a larger diameter at its inner end, a coupling m er adapted t draw and hold the o 'osing surfaces 1n close contact, a compressilile cu -washer located in said recess and arrange to be expanded in the counter-bore of Said recess by fluid pressure, and a second washer in said cupw'asher adapted to hold the cup-washer in position and prevent its colla slng under fluid pressure; substantially as escribed.

' 4. A pipe. coupling comprising coupling membershaving opposing surfaces contacting with each other, one of said members having a centrally located annular recess, the other member having a centrally located annular boss projecting into said recess, a cup shaped washer in said recess, and a coupling ring to drawand hold the opposing faces in close contact with each other and to compress the bottom of the map shaped washer; substantially as describe I In testimony whereof, I have hereunto set my hand.

' -MATHEW F. KELLY.

v Witnesses:

ScorrM. STEWART,

D.'P. THOMAS. 

